/*===========================================================================*\
*                                                                           *
*                               OpenMesh                                    *
*      Copyright (C) 2001-2005 by Computer Graphics Group, RWTH Aachen      *
*                           www.openmesh.org                                *
*                                                                           *
*---------------------------------------------------------------------------* 
*                                                                           *
*                                License                                    *
*                                                                           *
*  This library is free software; you can redistribute it and/or modify it  *
*  under the terms of the GNU Library General Public License as published   *
*  by the Free Software Foundation, version 2.                              *
*                                                                           *
*  This library is distributed in the hope that it will be useful, but      *
*  WITHOUT ANY WARRANTY; without even the implied warranty of               *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU        *
*  Library General Public License for more details.                         *
*                                                                           *
*  You should have received a copy of the GNU Library General Public        *
*  License along with this library; if not, write to the Free Software      *
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
*                                                                           *
\*===========================================================================*/


//=============================================================================
//
//  Implements the baseclass for IOManager importer modules
//
//=============================================================================


#ifndef __BASEIMPORTER_HH__
#define __BASEIMPORTER_HH__


//=== INCLUDES ================================================================


// STL
#include <vector>

// OpenMesh
#include <Core/System/config.hh>
#include <Core/Math/VectorT.hh>
#include <Core/Mesh/Kernels/Common/BaseKernel.hh>


//== NAMESPACES ===============================================================


namespace OpenMesh {
	namespace IO {


		//=== IMPLEMENTATION ==========================================================


		/**  Base class for importer modules. Importer modules provide an
		*   interface between the loader modules and the target data
		*   structure. This is basically a wrapper providing virtual versions
		*   for the required mesh functions.
		*/
		class BaseImporter
		{
		public:

			// base class needs virtual destructor
			virtual ~BaseImporter() {}


			// add a vertex with coordinate \c _point
			virtual VertexHandle add_vertex(const Vec3f& _point) = 0;

			// add a face with indices _indices refering to vertices
			typedef std::vector<VertexHandle> VHandles;
			virtual FaceHandle add_face(const VHandles& _indices) = 0;

			// set vertex normal
			virtual void set_normal(VertexHandle _vh, const Vec3f& _normal) = 0;

			// set vertex color
			virtual void set_color(VertexHandle _vh, const Vec3uc& _color) = 0;

			// set vertex texture coordinate
			virtual void set_texcoord(VertexHandle _vh, const Vec2f& _texcoord) = 0;

			// set face normal
			virtual void set_normal(FaceHandle _fh, const Vec3f& _normal) = 0;

			// set face color
			virtual void set_color(FaceHandle _fh, const Vec3uc& _color) = 0;

			// get reference to base kernel
			virtual BaseKernel* kernel() { return 0; }

			virtual bool is_triangle_mesh()     const { return false; }

			// reserve mem for elements
			void reserve(unsigned int nV, unsigned int nE, unsigned int nF) { nV; nE; nF; }

			// query number of faces, vertices, normals, texcoords
			virtual size_t n_vertices()   const = 0;
			virtual size_t n_faces()      const = 0;
			virtual size_t n_edges()      const = 0;


			// pre-processing
			virtual void prepare()  {}

			// post-processing
			virtual void finish()  {}
		};


		//=============================================================================
	} // namespace IO
} // namespace OpenMesh
//=============================================================================
#endif
//=============================================================================
